Mains phase detection apparatus

a detection apparatus and main technology, applied in the direction of measuring devices, automatic control, instruments, etc., can solve the problem of inability to obtain a detection, and achieve the effect of improving the detection precision

Inactive Publication Date: 2010-01-12
MIARTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]The present invention provides a mains phase detection apparatus to overcome the deficiencies existing in the prior art. The detection apparatus is capable of effectively improving the detection precision for the mains phase.
[0006]In the mains phase detection apparatus of the present invention, an all-digital phase-locked loop with a high precision is added after a zero-crossing detector to provide a detection performance with an extremely high precision.

Problems solved by technology

However, since there is a large amount of noise and interference on the power line, the appearing time of the zero-crossing points will be affected, which thus causes it is impossible to obtain a detecting result with a high precision from such a simple zero-crossing detection method.

Method used

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Embodiment Construction

[0023]Please refer to FIG. 1, a mains phase detection apparatus of the present invention includes a zero-crossing detector 110, and an all-digital phase-locked loop constructed with a digital phase detector 111, a digital loop filter 112 and a digital controlled oscillator 113. Firstly, an analog signal obtained by sampling the mains is shaped by the zero-crossing detector (comparator) 110. Thus, the mains signal is converted from a sinusoidal wave with distortion to a square signal, which is sampled then by a clock signal to generate a 1 bit digital signal. The digital phase detector 111 of the phase-locked loop implement a phase comparison between an external input digital signal and an output signal of the digital controlled oscillator 113 (typically performed by a component with multiplication characteristics). The digital loop filter 112 implements low-pass filtering to generate an error control signal for adjusting the frequency of the output signal of the digital controlled o...

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Abstract

The present invention relates to an apparatus for accurately detecting a mains phase. The apparatus is constructed with a zero-crossing detector, a digital phase detector, a digital loop filter, and a digital controlled oscillator (DCO) of a direct digital synthesized (DDS) manner. The present apparatus employs an all-digital loop architecture and a high sampling clock to recover a signal with a phase orthogonal with the mains signal and a frequency the same as the mains signal. And jitters in the recovered signal are less than 10 us. The present apparatus is capable of implementing signal tracking of a zero frequency error and a zero phase in a wide range, and can provide a detection result of excellent performance for the power line carrier communication, mains frequency detection, etc.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application represents the national stage application of International Application PCT / CN2006 / 003082, filed 16 Nov. 2006, which claims the benefit of Chinese Patent Application 200510110391.3, filed 16 Nov. 2005, which is incorporated herein by reference in its entirety for all purposes.TECHNICAL FIELD[0002]The present invention relates to a phase detection apparatus, more particularly to a mains phase detection apparatus.BACKGROUND OF THE INVENTION[0003]It is required to detect the phase / frequency of a power line in various application fields, such as mains frequency monitoring, phase-controlled rectification, and mains phase detection in a power line carrier communication.[0004]A zero-crossing detection method is employed by conventional mains phase / frequency detection, i.e., a zero-crossing point is detected by a comparator, and a cycle and a frequency of the mains are then obtained by calculating the time interval between zero-cr...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H03L7/06
CPCH03L7/085H03L7/0994H03L2207/50
Inventor SONG, CHAOSHENGGOU, GANG
Owner MIARTECH
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